Improvement in the construction of safes



SAFES, BANK PHUll- UIIUN AND RELATED DEVLCESl f e f@ J 5 dntml gottes ,este een.

Letters PatentN 92,178, dated July 6, 1869.

IMPROVEMENT IN THE CONSTRUCTION OI' SAFES.

The Schedule referred to in these Lettera Patent: and making part of the same.

To all whom lt may concern:

Be it known that l, JOHN FARREL, of the city, county, and State of New York, have and useful Improvement inthe Construction of Burglar-Proof Safes, Bank-Vaults, and other like structures; and I do hereby declare that the following is a full and exact description of the same, reference being had to the annexed drawings, forming a part thereof, in which- Figure 1 is a vertical section, representing my iinprovement as appliedl to a safe-door frame and door, with the door shut; and

FigureQ, ahorizontal section, showing the door open.

'lhe same letters of reference indicate similar parts .in bothligures.

Burglar-proof safes, and such like structures, are 'usually constructed of alternate la 'ers of steel, and 4wrought-iron plates, of propel' thickness, or of steel and wrought-iron plates previously welded together,- in manuel' well known in the, arts, to prevent drilling to the inside.

I have ascertained that by drilling one or more holes through the outer plate-of the safe, or other structure, and then applying a blow-pipe to the'second plate, which is made of steel, and drill-proof', the temper of all the steel plates in the thickness of that side of the safe, at the pointl operated upon, can be entirely or very nearly drawn, s0 that the entire thickness can be readily drilled through.

rlhis result can be eifected without drilling the outer wrought-iron plate, by applying the blow-pipe directly' to its outer surface, but much more time is occupied in the operation.

rlhe ohjectof my invention is to prevent or retard the drawing of the temper from the hardened plates composing the shell and door of safes, bank-vaults, and such like structures; and

My invention consists in interposing, between the successive layers, of wrought-iron and steel plates, a sheet of any non-conducting material, or a layer 'ot any evaporating substance, that will prevent or in a very great degree retard the drawing of the temper from the steel plates, by the application of a blowpipe, or other means.

The annexed figures Vrepresent the door-flame and door of a safe, tration of the mode of applying my In the tiguresv v a represents the door, and b, the door-frame of a safe, or other like structure and these are represented in the said figs. l and 2, as composed of single layers `of wrought-iron and steel plates, c and d.

Between each of these plates, I interpose a sheet of mica, felt, wood, or any other equivalent non-conducting material, or a layer of plaster ofP-aris, alum,

thel plates forming simply as an illusinvention.

invented a new Epsom salts, or any other equivalent evaporating substance, marked e in the drawings.

The several plates, forming the thickness of the case of the safe land door, are secured together in the usual manner, as shown in the drawings.

It will he found that the interposed non-conducting or evaporating material, between the several plates, will, in a very great degree, retard, if it docs not entirely prevent the drawing of the temper from the steelplates by means ofthe blow-pipe, applied either to the surface of the outer wrmzght-iron plate, or through a hole or holes previously drilled through it.

\Vhen welded wrought-iron and. steel plates are used in the construction of the safe, a sheet of the non-comlueting or evaporating substance is interposed between the inner surface ot' the outer'wrought-iron plate c and the outer surface of the welded steel and iron plate (l, (see tig, 3,) and then these plates are secured together in the usual manner, as represented.

I then interpose another' sheet of the non-conducting or evalmrating substance between the inner surface ot' this welded plate and the outer surface of the next welded steel and iron plate, and so on, for any thickness of case required.

It will be evident that sheets formed of any nonconducting material can be interposed between the several layers of wrought-iron and hardened-steel plates, and also, that any evaporating substance may be substitutedas interposed layers between the several plates; and, therefore, I do not wish to limit my invention to the use of any particular non-conducting or evaporating substance.

The important advantage of this improvement consists in greatly delaying the operations ofthe burglar; because, with this interposed non-conducting or evaporating substance between the wrought-iron and steel plates, it will require a very long while for him to draw the temper from them; and this delay is lengthened by every successive layer of non conducting or evaporating substance interposed in the thickness of the case, and, therefore, his chances ot' access to the interior of the safe will be very remote before discovery.

What I claim as new, and desire to secure by Letters Patent, is-

Interpos'rng between the several layers of steel and Wrought-iron plates, composing the shell of burglarpruof safes, and other like structures, any non-conducting matcrial or evapoiating substance, as and for the purpose described.

J OHN FARREL.

Witnesses:

T. B. Bananen, E. G. Rnnnum'. 

